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Fig. 6. Transverse section of a Liposarcus pardalis retina. The arrow indicates the position of the external limiting membrane. The only photoreceptors seen throughout the retina are large rods and small single cones. Abbreviations: RPE, retinal pigment epithelium; ROS, rod outer segment; RIS, rod inner segment; COS, cone outer segment; CIS, cone inner segment. Scale bar, 50 µm.